Control of nitrogen oxides emission by selective non-catalytic reduction in preheating section during iron ore pellets production
由在预热的选择非催化的减小的氮氧化物排放的控制节在铁矿石小团期间生产作者机构：School of Minerals Processing and BioengineeringCentral South UniversityChangsha410083HunanChina Zhongye Changtian International Engineering Co.Ltd.Changsha410205HunanChina
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2022年第29卷第2期
页 面：215-222页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：This work was supported by the National Natural Science Foundation of China(51974371) Key Research and Development Program of Hunan Province(2018SK2049)
主 题：Iron ore pellet Grate-kiln process Flue gas Selective non-catalytic reduction denitration Denitration mechanism
摘 要：Reducing the NO_(x) emission from pelletizing process is of great importance to the green development of iron and steel *** flue gas temperature of preheating(PH)section during grate-kiln iron ore pelletizing process typically ranges within 850–1050℃,which meets the temperature requirements of selective non-catalytic reduction(SNCR)for NO_(x).The in-bed SNCR behavior of NO_(x) in the PH section was investigated,and the influence of relevant parameters was *** show that with the flue gas temperature rising,the denitration rate reached a peak value and then declined,where the appropriate temperature range was 950–1000℃.Increasing the NH_(3)/NO ratio(NSR)contributed to improving the denitration rate,and the appropriate NSR was *** content in the flue gas also showed an important influence on denitration rate,which reached a peak value and then dropped with the oxygen content *** the condition of 18 vol.%oxygen content,the denitration reaction mainly occurred in the form of 4NO+4NH_(3)+O_(2)=4N_(2)+6H_(2)*** restricting the competitive reaction of NH_(3) oxidation,the oxygen content in flue gas of PH section should be kept at an appropriate *** general,the denitration rate reached about 25%in the PH section through spraying ammonia.
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